Concrete Block Fill Calculator
Construction & Home ImprovementCalculate the volume of grout or concrete needed to fill the hollow cavities inside a CMU block wall.
Fill Volume Needed
Cubic feet of grout or concrete needed to fill the hollow cores.
80 Lb Premix Bags
60
Assumes a standard 80 pound premix bag yields 0.6 cubic feet.
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Calculator Stats
Creators
Odeh Ahwal0people find this calculator helpful
Views
Helpful
Saved
Embeds
Construction & Home Improvement calculators
Frequently Asked Questions
Why is cavity volume per block an editable field?
The hollow core volume of a CMU block genuinely varies by block design and manufacturer, commonly ranging from about 0.15 to 0.35 cubic feet for a standard 8 inch block. Check your specific block specification sheet for the most accurate figure rather than relying on a single universal default.
Is this the same as the Concrete Block Calculator?
They share the same wall dimension and block size inputs, but the Concrete Block Calculator counts how many blocks you need to buy, while this calculator estimates how much grout or concrete fills the hollow spaces inside blocks already in place.
Do all block cores in a wall get filled?
Not always. Some projects only fill cores containing rebar for reinforcement, not every cell. Adjust your effective cavity volume accordingly if you are only filling select cores.
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